Three-port DC-DC converter for stand-alone photovoltaic systems


System efficiency and cost effectiveness are of critical importance for photovoltaic (PV) systems. This paper addresses the two issues by developing a novel three-port dc-dc converter for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking (MPPT), high step-up ratio, galvanic isolation, and multiple operating modes for domestic and aerospace applications. A theoretical analysis is conducted to analyze the operating modes followed by simulation and experimental work. This paper is focused on a comprehensive modulation strategy utilizing both PWM and phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. A 250-W converter was designed and prototyped to provide experimental verification in term of system integration and high conversion efficiency.

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Divisions: College of Engineering & Physical Sciences
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Uncontrolled Keywords: DC–DC power conversion,maximum power point tracking,phase shift,photovoltaic power system,voltage control
Full Text Link: http://ieeexplo ... rnumber=6838982
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PURE Output Type: Article
Published Date: 2015-06
Published Online Date: 2014-06-18
Accepted Date: 2014-05-30
Submitted Date: 2014-02-07
Authors: Hu, Yihua
Xiao, Weidong
Cao, Wenping (ORCID Profile 0000-0002-8133-3020)
Ji, Bing
Morrow, D. John



Version: Accepted Version

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